WO1998023352A1 - System for draining a liquid storage tank - Google Patents
System for draining a liquid storage tank Download PDFInfo
- Publication number
- WO1998023352A1 WO1998023352A1 PCT/BR1997/000050 BR9700050W WO9823352A1 WO 1998023352 A1 WO1998023352 A1 WO 1998023352A1 BR 9700050 W BR9700050 W BR 9700050W WO 9823352 A1 WO9823352 A1 WO 9823352A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drainage
- valve
- storage tank
- float
- line
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/041—Breaking emulsions with moving devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2931—Diverse fluid containing pressure systems
- Y10T137/3003—Fluid separating traps or vents
- Y10T137/3102—With liquid emptying means
Definitions
- the present invention relates to equipment for draining precipitated liquids, especially water, which collect at the bottom of a tank for storing liquids.
- the equipment of the present invention makes it possible to drain off the precipitated liquids which accumulate at the bottom of such a storage tank.
- Storage tanks are often used in the petroleum industry and are essential to the functioning of an operational unit. They may, for example, be for storing crude oil, intermediate products or final products.
- Delay in draining the aqueous phase out from the tank gives rise to a number of problems. There may be a loss in product storage capacity, due to the formation of a layer of sludge. There may be corrosion of the bottom caused by the accumulation of the aqueous phase. There may be an interruption of production operations in order to allow the storage tank to be cleaned or even the replacement of the damaged bottom of the tank. It may be necessary to re-paint the metal plates making up the bottom of the tank in order to protect them against corrosion. Also, there may be a need to install sacrificial anodes in the internal part of the bottom of the tank in order to provide protection against corrosion.
- the present invention proposes the adoption of a system, for draining a tank for storing liquids, which may be automatic or manual and prevents the accumulation of an aqueous phase at the bottom of the tank.
- a first aspect of the present invention provides a system for draining a liquid storage tank, which is intended to promote removal, from inside the storage tank, of denser phase which is deposited in the bottom of the tank below a less dense phase which is not to be drained, characterized in that it is operated automatically and comprises the following components: a) a drainage device to be fitted at the lowest level of said liquid storage tank, said drainage device comprising a concave body which ends in a seat, an interface float which sinks into the less dense phase and floats on the denser phase and thus prevents the formation of a vortex when the denser phase is being drained off, means actuated by the float for plugging the seat, and stop means which limits the travel of the interface float inside the drainage device but allows the passage of liquids; b) a drainage line connecting the seat of the drainage device to a drainage box which is connected to a drain line; c) a shut-off valve fitted in the drainage line and having an actuator which is intended to control the flow of liquid
- a second aspect of the invention provides a system for draining a liquid storage tank which is intended to promote removal, from inside the storage tank, of a denser phase which is deposited in the bottom of the tank below a less dense phase, characterized in that it is operated manually and comprises the following components: a) a drainage device to be fitted at the lowest level of said liquid storage tank, said drainage device comprising a concave body which ends in a seat, an interface - -
- float which sinks into the less dense phase and floats on the denser phase and thus prevents the formation of a vortex when denser phase is being drained off, means actuated by said interface float for plugging the seat, and stop means which limits the travel of the interface float inside the drainage device but allows the passage of liquids; b) a drainage line connecting the seat of the drainage device to a drainage box which is connected to a drain line; c) a first manual shut-off valve fitted in the drainage line and intended to control the flow of liquid which passes to the drainage box; d) a pressure-equalization line connecting the concave body of the drainage device to the drainage box; e) a second manual shut-off valve fitted in the pressure-equalization line, and operative to promote the equalization of the pressures below and above the interface float after the plugging means has settled on the seat of the drainage device; and f) a level gauge, for inspecting the liquid level in the tank, intended to be fitted in the bottom of the side wall of the
- This interface float is designed to sink into the product and to float on top of the denser phase underneath the product. As the level of the denser phase drops, the plug portion of the interface float settles onto the seat, stopping the drainage operation since all the accumulated denser phase has now been drained off.
- the drainage system may thus be manual or automatic.
- an operator periodically checks for the presence of an aqueous (denser) phase inside the storage tank via a port for inspecting the level. If such a phase were to accumulate, he opens a manual shut-off valve so as to allow all the accumulated aqueous (denser) phase to drain away.
- a sensor may be fitted in the drainage line to detect an undesired passage of product (less dense phase) and to command closing of the shut-off valve which controls drainage in response to detection of product passing the sensor.
- FIG. 1 shows a tank for storing liquids which is equipped with a system of the present invention, for automatic drainage of tanks for storing liquids;
- Figure 2 shows a tank for storing liquids which is equipped with an alternative system of the present invention, for draining tanks for storing liquids;
- Figure 3 shows a tank for storing liquids which is equipped with a further alternative system of the present invention, for draining tanks for storing liquids;
- Figure 4 shows a drainage device used in the system of the present invention, for draining tanks for storing liquids.
- FIG. 1 shows a storage tank 1 equipped with an automatic system according to the present invention, for draining tanks for storing liquids.
- the tank 1 has a side wall 6, a foundation ring 5, a floating roof 2, and a bottom 3 having its centre lower than the edges and also a ramp 4 which makes drainage more efficient.
- Any product generally a hydrocarbon, can be stored inside the storage tank 1 and the fact that the roof 2 floats on the product prevents any inflammable gaseous phase from occurring above the liquid surface.
- the system for draining liquid storage tanks may be used in any type of storage liquid tank, irrespective of the shape of the tank bottom; the type of tank mentioned above is chosen only to facilitate the description of the invention.
- a drainage device 30 is fitted at the lowest part of the ramp 4, as close as possible to the foundation ring 5 of the storage tank 1 ; this is the lowest level at which there can be a deposit of liquid.
- the drainage device 30 which may be seen better in Figure 4, comprises a concave body 31 which may, for example, be frustoconical or polyhedral. Inside the concave body 31 there is an interface float 8 which has a plug portion 25 at the bottom. A guide 9 is fitted over the concave body 31 and its function is to serve as stop means to limit the upward travel of the interface float 8. The guide 9 may be constructed so as to allow the liquid to pass without difficulty to the inside of the drainage device 30.
- FIG. 1 shows that the drainage line 10 and the pressure-equalization line 23 extend beyond the foundation ring 5 of the storage tank 1 and end in the drainage box 13.
- a normally closed shut-off valve 11 having an actuator 11 A is fitted in the drainage line 10
- a normally closed pressure-equalization valve 24, having an actuator 24A is fitted in the pressure- equalization line 23.
- the bottom of, the drainage box 13 has an outlet to the discharge line 22 through which the drained aqueous phase will drain off. It is expedient for the drainage box 13 to be as high as, or higher than, the useful height of the side walls of the containment basin 50 of the storage tank 1 so as to ensure that there will be no undesirable communication between the containment basin and the discharge line 22.
- a drain line 20, having a shut-off valve 21, is fitted in the bottom of the drainage box 13. This line 20 makes it possible for any drainage of the containment basin wall to be carried out via the drainage box 13. To do this, it is sufficient to open the shut-off valve 21.
- the containment basin 50 which is not part of the invention, is the area limited by depressions or wails (dykes) on the ground intended to contain the fluids of the tank in case of a leakage. In the drawings only a small part of it is shown.
- a sensor 12 is fitted in the bottom of the side 6 of the storage tank 1 slightly above the level of the drainage device 30. Its function is to detect the presence of an aqueous phase and to emit a command signal to the actuator 24A of the pressure- equalization valve 24 and to the actuator 11 A of the shut-off valve 11 , as will be better understood below.
- the storage tank 1 normally receives the product which it is desired to store. If there should be any precipitation of aqueous phase, this tends to deposit in the bottom of the storage tank 1 because it is denser than the product.
- the interface float 8 is designed to float on the aqueous phase and to sink into the product thereabove.
- the drainage device 30 is located in the lower part of the storage tank 1 , which results in the precipitated aqueous phase accumulating around it.
- the interface float 8 floats on aqueous phase, the passage to the drainage line 10 is unobstructed, which makes it possible for the precipitated aqueous phase to pass _ _
- the level of the precipitated aqueous phase will rise until it reaches the sensor 12 which, on detecting the presence of an aqueous phase, immediately emits a signal to the actuator 11 A to command the opening of the shut-off valve 11 for a preestablished period of time sufficient to allow all the aqueous phase to drain off to the inside of the drainage line 10.
- the presence of the interface float 8 prevents the formation of a vortex inside the drainage device 30, which could wrongly give rise to drainage of product even though there might still be remaining aqueous phase to be drained off.
- the interface float 8 will also drop, and its plug portion 25 approaches the seat 26.
- the plug portion 25 will settle on the seat 26, closing the passage and preventing the outflow of product via the drainage line 10, thereby completing the drainage process.
- the pre-established period during for the shut- off valve 11 to remain open will then end, and the valve again closes.
- the sensor 12 emits a signal to the actuator 24A to command opening of the pressure-equalization valve 24 for a predetermined period of time which is sufficient for pressure equalization to occur, after which the pressure-equalization valve 24 closes once again.
- the interface float 8 again floats on the aqueous phase, initiating a new drainage cycle.
- FIG. 2 shows a variation of the system, according to the present invention, for draining tanks for storing liquids.
- a sensor 17 is fitted in the drainage line 10. Its function is to detect an undesired passage of product through the drainage line 10, which would signify an operational failure of the drainage device 30.
- the sensor 17 would emit a command signal to the actuator 11 A, which would immediately close the shut-off valve 11, thereby interrupting an undesired flow of product to the drainage box 13.
- the sensor 17 may also send a signal to a remote panel installed in a control room, for example, where some type of alarm would alert the operator in charge to the problem so that the operator can immediately take the necessary measures to rectify it.
- Various types of sensor may be used to function as the sensor 12. It is possible, for example, to use a liquid level switch, a conductivity sensor or a capacitive sensor.
- use may also be made of various types of sensor for the sensor 17. Purely by way of example, use may be made of a conductivity sensor or a capacitive sensor.
- the drainage system for tanks for storing liquids may also be operated manually.
- a liquid level gauge 28 for inspecting the level may be fitted instead of the sensor 12, a manual shut-off valve 29 instead of the actuated shut-off valve 11, and a manual shut-off valve 27 instead of the pressure- equalization valve 24.
- the system would then be operated by an operator who would periodically check for the presence of an aqueous phase in the level indicator. If such a phase were to accumulate, it would signify the need to drain off the aqueous phase that had accumulated in the bottom of the tank. To this end, it would suffice to open the manual shut-off valve 29, which would make it possible for all the aqueous phase to drain off to the drainage box 13.
- the drainage device 30 would operate exactly as described above, enabling all the accumulated aqueous phase to drain off.
- the plug 25 is formed on the interface float 8, but it is also possible that the float actuates an external plug, and the aforesaid description should not be taken as a limitation of the invention.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Control Of Non-Electrical Variables (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Devices For Dispensing Beverages (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Float Valves (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
- Photographic Developing Apparatuses (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19970941750 EP0946237B1 (en) | 1996-11-26 | 1997-09-18 | System for draining a liquid storage tank |
EA199900412A EA001162B1 (en) | 1996-11-26 | 1997-09-18 | System for draining a liquid storage tank |
CA 2270212 CA2270212C (en) | 1996-11-26 | 1997-09-18 | System for draining a liquid storage tank |
JP51013998A JP3357676B2 (en) | 1996-11-26 | 1997-09-18 | System for draining liquid storage tanks |
DE69704569T DE69704569T2 (en) | 1996-11-26 | 1997-09-18 | SYSTEM FOR DRAINING LIQUID TANKS |
AU43728/97A AU729384B2 (en) | 1996-11-26 | 1997-09-18 | System for draining a liquid storage tank |
NO19992520A NO321248B1 (en) | 1996-11-26 | 1999-05-26 | Drainage system for a liquid storage tank |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9605709A BR9605709A (en) | 1996-11-26 | 1996-11-26 | Drainage system for liquid storage tanks |
BRPI9605709-2 | 1996-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998023352A1 true WO1998023352A1 (en) | 1998-06-04 |
Family
ID=36337507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR1997/000050 WO1998023352A1 (en) | 1996-11-26 | 1997-09-18 | System for draining a liquid storage tank |
Country Status (20)
Country | Link |
---|---|
US (1) | US5935427A (en) |
EP (1) | EP0946237B1 (en) |
JP (1) | JP3357676B2 (en) |
KR (1) | KR100346012B1 (en) |
CN (1) | CN1089619C (en) |
AR (1) | AR010072A1 (en) |
AU (1) | AU729384B2 (en) |
BR (1) | BR9605709A (en) |
CA (1) | CA2270212C (en) |
CO (1) | CO4770878A1 (en) |
DE (1) | DE69704569T2 (en) |
EA (1) | EA001162B1 (en) |
ES (1) | ES2156005T3 (en) |
ID (1) | ID18984A (en) |
NO (1) | NO321248B1 (en) |
PT (1) | PT946237E (en) |
SA (1) | SA97180707B1 (en) |
UY (1) | UY24790A1 (en) |
WO (1) | WO1998023352A1 (en) |
ZA (1) | ZA9710645B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103511831A (en) * | 2013-10-25 | 2014-01-15 | 浙江光普太阳能科技有限公司 | Drainage device for air storage tank |
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US6261462B1 (en) * | 1999-05-20 | 2001-07-17 | Clearline Systems, Inc. | Combination pump and separator, especially for commercial kitchens |
US20030042256A1 (en) * | 2001-09-05 | 2003-03-06 | Johnson Burton M. | Floating cover |
US6814841B2 (en) * | 2002-04-24 | 2004-11-09 | Proton Energy Systems, Inc. | Gas liquid phase separator with improved pressure control |
US8974662B2 (en) * | 2002-10-30 | 2015-03-10 | William J Gannon | Filtration of a pumped hydrocarbon containing liquid |
US20070034580A1 (en) * | 2005-08-11 | 2007-02-15 | Stein Matthew L | Fluid filter arrangement including valve arrangement and methods |
WO2011059919A1 (en) * | 2009-11-12 | 2011-05-19 | Shell Oil Company | Subsea separation systems |
US9086354B2 (en) * | 2010-07-22 | 2015-07-21 | Saudi Arabian Oil Company | Sound-velocity dewatering system |
WO2013090974A1 (en) * | 2011-12-23 | 2013-06-27 | Linc Energy Ltd | Method and system for treating a waste stream derived from ucg product gas |
EP3909633B1 (en) * | 2013-03-14 | 2023-11-22 | Fisher & Paykel Healthcare Limited | Humidification chamber with a mixing element comprising microstructures |
US9702751B2 (en) * | 2013-04-15 | 2017-07-11 | Floyd Stanley Salser, JR. | Dual measurement tank with nested structure |
CA2983639C (en) * | 2015-04-22 | 2023-12-12 | Mark S. RAUCH | Oil monitoring system |
CN106039769A (en) * | 2016-06-23 | 2016-10-26 | 武汉工程大学 | Storage tank for oil-water separation |
DE102016119404B4 (en) * | 2016-10-12 | 2018-05-09 | PILODIST GmbH | Phase separators and methods for separating immiscible liquids |
CN110177608A (en) | 2016-10-24 | 2019-08-27 | M·S·劳赫 | Petroleum monitors system |
CN110466784B (en) * | 2019-08-18 | 2021-07-02 | 南通华夏飞机工程技术股份有限公司 | Aircraft tank anticorrosion structure |
CN110589271B (en) * | 2019-09-19 | 2021-03-30 | 浙江海洋大学 | Oil tank with anti-corrosion function |
CN111637272A (en) * | 2020-06-04 | 2020-09-08 | 无锡英罗唯森科技有限公司 | Self-operated liquid level regulating device |
CN113739074B (en) * | 2021-09-22 | 2023-05-16 | 凯泰(滁州)流体控制有限公司 | Automatic identification and drainage method and device for spherical tank low-level pipeline deposited water |
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FR671406A (en) * | 1929-03-13 | 1929-12-12 | Automatic drain | |
GB362466A (en) * | 1930-07-05 | 1931-12-07 | David Samiran | Improvements in fluid separators |
US2844254A (en) * | 1955-06-16 | 1958-07-22 | Ulric F Ansley | Apparatus for removing water from organic liquids and fuels |
FR1285077A (en) * | 1961-03-29 | 1962-02-16 | Faudi Feinbau | Control device for water separators in filter tanks for liquid fuels |
FR1516420A (en) * | 1965-06-28 | 1968-03-08 | Exxon Research Engineering Co | Method and apparatus for separating immiscible liquids |
US4264442A (en) * | 1979-05-29 | 1981-04-28 | Jackson Dirk C | Liquid traps |
EP0034689A1 (en) * | 1980-02-25 | 1981-09-02 | SOCIETE D'ETUDE ET DE REALISATION D'EQUIPEMENTS SPECIAUX - S.E.R.E.S. Société anonyme dite: | Device for the automatic separation of liquid deposited on the bottom of a reservoir containing two non-miscible liquids |
GB1600271A (en) * | 1978-04-25 | 1981-10-14 | Gough D V | Separating devices |
US4447321A (en) * | 1982-03-29 | 1984-05-08 | Jackson Henry D | Liquid drain system |
US4611627A (en) * | 1985-02-07 | 1986-09-16 | Donaldson Company, Inc. | Self-venting drain valve |
GB2236960A (en) * | 1989-10-19 | 1991-04-24 | Ludlam Sysco Limited | Water drainage system |
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US2626054A (en) * | 1950-09-29 | 1953-01-20 | Henigman Frank | Oil tank water drainer |
GB1072467A (en) * | 1965-06-28 | 1967-06-14 | Exxon Research Engineering Co | Improvements in separating liquids |
DE2450715A1 (en) * | 1974-10-25 | 1976-04-29 | Siegrist Kg Tabakfab | Non miscible liquids esp solvent and water separated - in long settling tank with float in close fitting chamber |
FR2434642A1 (en) * | 1978-09-01 | 1980-03-28 | Seres | Purging liq. automatically from tank contg. two immiscible liquids - by motorised valve controlled by capacitive probe placed in pipe downstream of valve |
US5138653A (en) * | 1988-09-06 | 1992-08-11 | Patrick Le Clercq | System for automatic notification of the receipt of messages in an electronic mail system |
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-
1996
- 1996-11-26 BR BR9605709A patent/BR9605709A/en not_active IP Right Cessation
-
1997
- 1997-09-18 CN CN97199868A patent/CN1089619C/en not_active Expired - Lifetime
- 1997-09-18 PT PT97941750T patent/PT946237E/en unknown
- 1997-09-18 EA EA199900412A patent/EA001162B1/en not_active IP Right Cessation
- 1997-09-18 KR KR1019997003578A patent/KR100346012B1/en not_active IP Right Cessation
- 1997-09-18 EP EP19970941750 patent/EP0946237B1/en not_active Expired - Lifetime
- 1997-09-18 WO PCT/BR1997/000050 patent/WO1998023352A1/en active IP Right Grant
- 1997-09-18 ES ES97941750T patent/ES2156005T3/en not_active Expired - Lifetime
- 1997-09-18 AU AU43728/97A patent/AU729384B2/en not_active Expired
- 1997-09-18 DE DE69704569T patent/DE69704569T2/en not_active Expired - Lifetime
- 1997-09-18 JP JP51013998A patent/JP3357676B2/en not_active Expired - Lifetime
- 1997-09-18 CA CA 2270212 patent/CA2270212C/en not_active Expired - Lifetime
- 1997-11-25 AR ARP970105518 patent/AR010072A1/en unknown
- 1997-11-25 UY UY24790A patent/UY24790A1/en not_active IP Right Cessation
- 1997-11-26 US US08/979,347 patent/US5935427A/en not_active Expired - Lifetime
- 1997-11-26 ZA ZA9710645A patent/ZA9710645B/en unknown
- 1997-11-27 ID ID973796A patent/ID18984A/en unknown
- 1997-11-28 CO CO97069881A patent/CO4770878A1/en unknown
- 1997-12-13 SA SA97180707A patent/SA97180707B1/en unknown
-
1999
- 1999-05-26 NO NO19992520A patent/NO321248B1/en not_active IP Right Cessation
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR671406A (en) * | 1929-03-13 | 1929-12-12 | Automatic drain | |
GB362466A (en) * | 1930-07-05 | 1931-12-07 | David Samiran | Improvements in fluid separators |
US2844254A (en) * | 1955-06-16 | 1958-07-22 | Ulric F Ansley | Apparatus for removing water from organic liquids and fuels |
FR1285077A (en) * | 1961-03-29 | 1962-02-16 | Faudi Feinbau | Control device for water separators in filter tanks for liquid fuels |
FR1516420A (en) * | 1965-06-28 | 1968-03-08 | Exxon Research Engineering Co | Method and apparatus for separating immiscible liquids |
GB1600271A (en) * | 1978-04-25 | 1981-10-14 | Gough D V | Separating devices |
US4264442A (en) * | 1979-05-29 | 1981-04-28 | Jackson Dirk C | Liquid traps |
EP0034689A1 (en) * | 1980-02-25 | 1981-09-02 | SOCIETE D'ETUDE ET DE REALISATION D'EQUIPEMENTS SPECIAUX - S.E.R.E.S. Société anonyme dite: | Device for the automatic separation of liquid deposited on the bottom of a reservoir containing two non-miscible liquids |
US4447321A (en) * | 1982-03-29 | 1984-05-08 | Jackson Henry D | Liquid drain system |
US4611627A (en) * | 1985-02-07 | 1986-09-16 | Donaldson Company, Inc. | Self-venting drain valve |
GB2236960A (en) * | 1989-10-19 | 1991-04-24 | Ludlam Sysco Limited | Water drainage system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103511831A (en) * | 2013-10-25 | 2014-01-15 | 浙江光普太阳能科技有限公司 | Drainage device for air storage tank |
Also Published As
Publication number | Publication date |
---|---|
ES2156005T3 (en) | 2001-06-01 |
EA001162B1 (en) | 2000-10-30 |
EP0946237B1 (en) | 2001-04-11 |
CO4770878A1 (en) | 1999-04-30 |
JP2000507500A (en) | 2000-06-20 |
ZA9710645B (en) | 1998-06-12 |
CN1089619C (en) | 2002-08-28 |
BR9605709A (en) | 1998-08-11 |
UY24790A1 (en) | 1997-12-04 |
AU729384B2 (en) | 2001-02-01 |
PT946237E (en) | 2001-09-28 |
CA2270212C (en) | 2002-09-10 |
NO992520L (en) | 1999-05-26 |
EA199900412A1 (en) | 2000-04-24 |
CN1237917A (en) | 1999-12-08 |
ID18984A (en) | 1998-05-28 |
NO321248B1 (en) | 2006-04-10 |
AU4372897A (en) | 1998-06-22 |
KR100346012B1 (en) | 2002-07-24 |
JP3357676B2 (en) | 2002-12-16 |
EP0946237A1 (en) | 1999-10-06 |
CA2270212A1 (en) | 1998-06-04 |
SA97180707B1 (en) | 2006-08-14 |
DE69704569T2 (en) | 2001-08-09 |
DE69704569D1 (en) | 2001-05-17 |
AR010072A1 (en) | 2000-05-17 |
US5935427A (en) | 1999-08-10 |
KR20000052770A (en) | 2000-08-25 |
NO992520D0 (en) | 1999-05-26 |
MX9708578A (en) | 1998-09-30 |
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